There are several English Sanskrit dictionaries online. However,
most of them do not function properly and are poorly uploaded. Here is a one of
the best English Sanskrit dictionary. It is the Practical Sanskrit English
dictionary published by V S Apte from Poona in the year 1957 – 59. University
of Chicago is offering the dictionary online for free. It is not a pdf version
but you can search all the important terms and find its meanings and other
details.